The Upside Size Guide: What Size Am I in The Upside? Fit Advice & UK Sizing Help
Author: Stylist and brand team at Tellar
Date: 2025
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The Upside Size Guide: What Size Am I in The Upside? UK Fit Tips & Sizing Help
Find your perfect size in The Upside. Discover if this activewear brand runs big or small, with Tellar’s UK sizing guide and free body-matching tool.
The Upside, the Australian activewear label beloved for its polished prints, luxe fabrics and wearable performance gear, is fast becoming a cult favourite for stylish women in motion. From yoga and barre to school runs and airport lounges, The Upside blurs the line between athleisure and elevated sportswear. But that brings us to the essential question: What size am I in The Upside?
📌 Quick answer: Tellar.co.uk matches your real body measurements to The Upside—and thousands of other brands. Our database grows daily. You’ll also receive a free soft tape measure by post to ensure the most accurate results.
About The Upside: Sporty, Stylish, and Always Functional
Founded in Sydney by Jodhi Meares, The Upside is known for:
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Refined sportswear with feminine design touches
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Signature patterned leggings, wrap tanks and soft sports bras
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Comfort-driven fabrics that balance style and stretch
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A focus on sustainability and conscious fashion
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Sizes typically ranging from XXS to XL (UK 6–16)
The brand promises a luxe feel and performance fit—but with fashion-led cuts, you’ll want to size thoughtfully, especially in bras, leggings and fitted layers.
So, Does The Upside Run Big or Small?
In general:
The Upside runs true to size, but some fitted pieces (like leggings and bras) run slightly small, especially for curvier body types or those in-between sizes.
👖 Leggings & Tights
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7/8 and full-length, often mid-rise
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Smooth compression fabric, but no super-firm control
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Fit tip: True to size for slim/athletic builds—size up if you’re curvier or between sizes
👕 Tanks & Tees
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Relaxed cuts with drawstring hems or wrap elements
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Often cropped or hip-grazing
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Fit tip: True to size—size down if you want a closer fit
👚 Sports Bras
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Medium support for most sizes
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Elasticated underband and racerback cuts
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Fit tip: Runs slightly small in the band—size up for fuller busts or broad backs
🧥 Sweaters, Wrap Tops & Jackets
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Layering pieces with a luxe loungewear vibe
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Some cropped, some oversized
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Fit tip: True to size, check sleeve length with Tellar
🎯 Use Tellar now to find your perfect size in The Upside using your actual bust, waist, hip, torso and arm length.
The Upside Sizing vs UK High-Street & Activewear Brands
The Upside uses lettered sizing (XXS–XL) with a typical UK fit, but compared to other performance brands, its cuts are more flattering and fashion-forward than ultra-compressive.
| The Upside Size | UK Equivalent | Fit Insight |
|---|---|---|
| XXS | UK 6 | Best for petite or straight-frame builds |
| XS | UK 8 | True to size, snug at waist |
| S | UK 10 | Standard fit, best for hourglass shape |
| M | UK 12 | Slight compression, check hip fit |
| L–XL | UK 14–16 | True to size—less compressive than Lululemon |
📏 Tellar.co.uk converts sizing across brands, and adjusts for torso length, rise, waistline and bust-to-band proportions—crucial for accurate fit.
Fabric Fit Breakdown
The Upside’s pieces balance comfort and sculpting without extreme compression. But the fit still varies by collection and fabric.
🧵 Compression Jersey
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Four-way stretch
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Feels smooth and light—not overly firm
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Fit tip: True to size—size up if you dislike snug waists
✨ Technical Rib or Luxe Knit
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Used in bras, tanks, and wrap tops
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Can stretch out over time
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Fit tip: Size down for fitted feel, stay true for casual drape
🌬️ French Terry & Fleece
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Found in sweatshirts and outerwear
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Soft, breathable and slightly oversized
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Fit tip: Relaxed fit—use Tellar for sleeve and torso length
Popular The Upside Pieces & How They Fit
1. Arrow 7/8 Leggings
Core style with printed detail, mid-rise waistband.
➡️ Fit tip: True to size if slim-hipped—size up if between sizes
2. Racerback Bra
Classic medium-support bra with scoop front and cutaway back.
➡️ Fit tip: Runs small in band and shoulder straps—size up if busty
3. Peach Slim Tank
Wrap-style tank with curved hem and breathable fabric.
➡️ Fit tip: True to size—slightly cropped fit
4. Bondi Crew
Relaxed sweatshirt with cuffed sleeves and signature logo.
➡️ Fit tip: Oversized by design—stay true or size down for tailored look
5. Printed Yoga Shorts
Mid-thigh length with curved hem and high waist.
➡️ Fit tip: True to size—but hip-hugging on curvier figures
The Upside vs Other Activewear Brands
| Brand | Compared to The Upside |
|---|---|
| Lululemon | The Upside is more relaxed—less compressive |
| Alo Yoga | Similar feel—The Upside fits shorter torsos better |
| Solo | Solo is more sculpted and body-hugging |
| Nike | Nike’s performance lines are tighter |
| Reebok | Reebok cuts are boxier—more forgiving |
🧠 Use Tellar to compare them all instantly using your body profile.
Common Fit Complaints (And How Tellar Solves Them)
❌ “The waistband rolled down during workouts.”Tellar calculates your waist-to-hip ratio and recommends leggings that stay in place.
❌ “The bra dug in under my bust.”Tellar adjusts for band width and cup volume, not just top size.
❌ “The top was cute but too cropped on me.”Tellar takes your torso length into account—essential for wrap tanks and fitted vests.
Why Use Tellar Before Buying The Upside?
The Upside is beautifully made—but its performance cuts can surprise new shoppers. Tellar.co.uk gives you peace of mind before you buy.
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✅ Match your exact shape to The Upside and thousands of brands
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✅ Receive a free tape measure to measure yourself at home
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✅ Adjust for waist, hip, bust, rise, and torso length
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✅ Compare fit across Alo Yoga, Lululemon, Reebok & more
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✅ 100% free to use—no guessing, no returns, no stress
🎯 Create your free Tellar profile now
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Final Thoughts: The Upside Sizing Is Refined—But Fit Can Vary by Piece
The Upside combines fashion and function better than most—but structured bras and slim leggings can run small if you’re not used to premium activewear sizing. Tellar saves you from returns and disappointment.
With Tellar.co.uk, you can find your size in The Upside—and thousands of other brands—using real data, not generic charts.
“Find your size in thousands of brands. It’s free & easy.”🎯 Use Tellar Now